tentukaan persamaan garis yang melalui (1,2) dan (3,4)

Diket = x1 = 1, y1 =2
x2 = 3, y2 = 4
Dit = persamaan garis
Jawab =
y-y1 per y2-y1 = x-x1 per x2-x1
y-2 per 4-2 = x-1 per 3-1
y-2 per 2. = x-1 per 2
Dikalikan silang, jadi
2(y-2) = 2(x-1)
2y-4 = 2x-2
2y-2x = -2+4
2y-2x = 2
y-x = 1